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參數(shù)資料
| 型號(hào)： | NT6880H |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Keyboard Controller |
| 中文描述： | 鍵盤控制器 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 289K |
| 代理商： | NT6880H |
NT6880
7
10. LED PORT
There are 3 LED direct sink pins which require no external serial resistors. The address is mapped to address $00C9.
Addr.
$00C9
Register
LED
Bit7
-
Bit6
-
Bit5
-
Bit4
-
Bit3
-
Bit2
LED2
Bit1
LED1
Bit0
LED0
R/W
(W)
SD
D
L
Q
W R E N
DB
RST
LED [ 0 ]
SD
D
L
Q
W R E N
DB
RST
V
DD
LED [ 1:2 ]
Figure 10.1. LED0
Port Structure
Figure 10.2. LED1, LED2 Port Structures
11. Watch-Dog Timer (WDT)
NT6880 implements a watch-dog timer, which protects programs against system standstill. The clock of the watch-dog
timer is derived from the on-chip RC oscillator. The watch-dog timer interval is about 0.175 of a second. The timer must be
cleared within every 0.175 second during normal operation; otherwise, it will overflow and cause a system reset. The
watch-dog timer is cleared and enabled after a system reset. It cannot be disabled by the software. A user can clear the
watch-dog timer by writing #55H to CLRWDT ($00CAH) register.
For example:
LDA
STA
Addr.
$00CA
#$55
$00CA
Register
CLRWDT
Bit7
0
Bit6
1
Bit5
0
Bit4
1
Bit3
0
Bit2
1
Bit1
0
Bit0
1
R/W
(W)
12. Low Voltage Reset (LVR) Circuit
The NT6880 will check on the voltage level of power supply. When the voltage level of power supply is below a threshold of
3.0V (Typical), the LVRC will issue a reset output to the chip until the power voltage level is above the threshold voltage of
3.0V (Typical) again. As soon as the power voltage arises to 3.0V (Typical), the entire chip will be reset for about 150ms.
13.
RESET
NT6880 can also be externally reset via the
RESET
pin. A reset is initiated when the signal at the
RESET
pin is held Low
for at least 10 system clocks. As soon as the
RESET
signal goes high, the NT6880 begins to be reset for about 150ms.
The following shows the definition of the
RESET
input low pulse width.
20%V
DD
20%V
DD
V
DD
Trstb
V
DD
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